I really cannot see how the calendar is even related to an issue like that. However, there are three things that are somewhat general that might help you.
1- FTP Transfer Type - has to be forced Binary for any file in the calendar folder. This could be an issue if you are (he is) using a syncing utility (like the way Frontpage and Dreamweaver work). But, as he fixed it by undoing something in Joomla, this is unlikely to be your issue.
2- The calendar uses the require() function to insert the bits in your page. If the path is changed, or broken, then the page will simply stop loading so you might have to look at the resulting source code of the page to see if an error is generated. Also a good troubleshooting technique is to change the require() function for the include() function. That will allow the rest of the page to load, and you might be able to see an error message then.
3- When integrated in a CMS, the calendar has to use the same database as the CMS. Verify that it is how yours is configured.
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